UKTC Archive

Re: neighbouring tree roots and RPAs

Subject: Re: neighbouring tree roots and RPAs
From: Brewster, Ian
Date: Mar 03 2021 12:13:00
I would see the restriction caused by multiple stems in a confined space a 
similar calculation for multiple stems below dbh (BS5837 2012) as a good 
starting point to determine radial protection extent. This is based on 
whatever is living above ground  requiring minimum rooting space to remain 
viable taking into account any obstacles such as standard highway to cause 
root displacement.

Get Outlook for Android<https://aka.ms/ghei36>
I would see the restriction caused by multiple stems in a confined space a 
similar calculation for multiple stems below dbh (BS5837 2012) as a good 
starting point to determine radial protection extent. This is based on 
whatever is living above ground  requiring minimum rooting space to remain 
viable taking into account any obstacles such as standard highway to cause 
root displacement.

Get Outlook for Android<https://aka.ms/ghei36>

________________________________
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
on behalf of Jasper Fulford-Dobson <jasper@xxxxxxxxxxxxxxx.com>
Sent: Wednesday, March 3, 2021 9:44:46 AM
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: neighbouring tree roots and RPAs

Has anyone else heard of the assertion that the roots of neighbouring trees 
present a significant physical barrier to each other with regards to the 
shape/extent/pattern of RPAs?

If there is any merit in this theory and how would it work for trees in 
closely spaced groups or woodlands?

My brief investigations into any science or common sense behind this has 
concluded the following: -

It seems to be widely accepted that roots can merge and even graft together 
(inosculation) to form rigid, interlocked systems, both within a single root 
system and between neighbouring trees of the same or differing species 
(Graham & Bormann 1966, Epstein 1977, Basnet et al 1993, Sprugel 2011 and 
Hirons 2018). Add to this the recognised theory of pathogenic transmission 
between root systems together with the complex and potentially vast nature of 
underground mycorrhizal associations and it becomes clear that attempting to 
draw an accurate picture of the exact rooting pattern for every given tree 
(particularly those in woodlands or closely spaced groups in urban sites with 
myriad man made structural barriers) is pure guestimation, even for an 
experienced arborist.

The narrative of the precise shape of such a polygon shaped RPA could 
therefore go on ad-infinitum right?

Any advice or feedback gratefully received.



--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk<https://www.stockholmtreepits.co.uk>
NPS
 ________________________________
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
on behalf of Jasper Fulford-Dobson <jasper@xxxxxxxxxxxxxxx.com>
Sent: Wednesday, March 3, 2021 9:44:46 AM
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: neighbouring tree roots and RPAs

Has anyone else heard of the assertion that the roots of neighbouring trees 
present a significant physical barrier to each other with regards to the 
shape/extent/pattern of RPAs?

If there is any merit in this theory and how would it work for trees in 
closely spaced groups or woodlands?

My brief investigations into any science or common sense behind this has 
concluded the following: -

It seems to be widely accepted that roots can merge and even graft together 
(inosculation) to form rigid, interlocked systems, both within a single root 
system and between neighbouring trees of the same or differing species 
(Graham & Bormann 1966, Epstein 1977, Basnet et al 1993, Sprugel 2011 and 
Hirons 2018). Add to this the recognised theory of pathogenic transmission 
between root systems together with the complex and potentially vast nature of 
underground mycorrhizal associations and it becomes clear that attempting to 
draw an accurate picture of the exact rooting pattern for every given tree 
(particularly those in woodlands or closely spaced groups in urban sites with 
myriad man made structural barriers) is pure guestimation, even for an 
experienced arborist.

The narrative of the precise shape of such a polygon shaped RPA could 
therefore go on ad-infinitum right?

Any advice or feedback gratefully received.



--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk<https://www.stockholmtreepits.co.uk>



-- 
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk

JPEG image